Centrifugal pump.



I. LEHNE & W. LUCKE.

CENTRIFUGAL PUMP.

. APPLICATION FILED APR. I0. I9I4. 191319,042. Patented 1111111111915.

2 SHEETS-SHEET I.

.Il LEHNE & W. LUCKE.

CENTRIFUGAL PUMP. 4 APPLICATION man 11.10. 1914.

1,189,042. y Patented May 11, 1915.

2 SHEETS-SHEET 2.

@u WM5 UNITED STATES PATENT oEEIcE.

` JosEF LEHNE' or TEMPELHOE, AND WILHELM LUCKE, or NEUKLLN, BERLIN, GEB,-

MANY, AssIeNons To INTERNATIQNALE noTATIoNsMAscHINEN-GESELLSCHAET MIT BEscHaIrx'rER HAETUNG, or BERLIN, GERMANY.-

` CENTRIFUGAL PUMP.

Specification of Letters Patent.

Patented May 11, 1915.

Application led April l0, 1914. Seria! No. 830,918.

To all whom it may concern.' o

Be it known that we, JOSEF LEHNE, a subject-of the Grand Duke of Hesse, and residing at Tempelhof, Berlin, Germany, and WILHELM LUCKE, a subject of the King of Prussia, and residing at Neuklln, Berlin, Germany, have invented certain new and useful Improvements in Centrifugal Pumps, of which the following is a specification.

The subject of this invention is an improved centrifugal pump of that class which combines the'advantages of a centrifugal pump with those of a piston pump, that is to say, a. pump which has a purely rotary motion, is of simple construction, is little affected by impurities and has a high eiliciency, and at the same time sucks also when the induction pipe is not filled.

The main feature of the invention is that an auxiliary device, which enables automatic suction, can be brought out of opera tion, so that Ithe pump then lacts under wholly normal conditions. Should the suction stream be interrupted, the auxiliary device can be thrown in again,f,either by hand or automatically.

Certain forms of construction of the new pump are illustrated in the accompanying drawings.

Figure l is a side elevation of one form of' the improved pump.l Fig. 2 is a longitudiial section through the same. Fig. 3 'is a cross section through Fig. 2, the valve being shown turned through 90 degrees. Fig. 4 is a longitudinal section and -part elevation of a modiication, drawn to a larger scale. Fig. 5. 'is a section on the line'A-B of Fig. et, the `valve being shown turned through 90 degrees.

kThe wheel or runner a of the centrifugal pump is mounted in the ordinary way in a casing b. If the delivery pipe c is closed and water is contained in the pum while the suction pipe dy is empty, there will be formed in the casing b, under the influencey of the centrifugal force, a ring of water, which revolves eccentrically with the blade wheel and as is well-known works together with the wheel in the manner of a rotary pump, the water at dii'erent parts of the periphery entering the cells, constituted by the blades and side walls, todii'erent depths, so that suction spaces are formed.

In the interior of the wheel a there is an axially slidable valve e provided, which lies concentric with the wheel and is of such construction that the side of thewheel on which there is an enlargement of the cell spaces, 1s 1n communication withthe suction pipe of the pump, while the air which has been sucked in is. driven out to` the atmosphere through a passage f in the valve and through an exit 'g (Figs. 1-3). Immediately water is seen in the exit g-which shows that the suction pipe is fullthe valve e is withdrawn from the wheel a, so that the pump now works as an ordinary centrifugal pump. The exit g is now cut ofi' from` the suction pipe. l ei'ected by means of a rod, el'and system of levers e?. For the purpose of insuring good closure, a back pressure valve, opening outward, may be provided in the exit g.

Referringto the modification illustrated in- Figs. 4 and 5, the pump casing b with suction and delivery pipes d, c, is of such construction that the valve@ can be wholly removed from the suction stream. When working normally, the water entering the wheel a does not pass through the valve e at all. In this case a back pressure valve g1 must be provided for -the aperture g, which I valve on discharging is closed automatically by the external air pressure, while on sucking it is opened by the internal over-pressure, so' that the air pumped can escape from the suction pipe.

In cases in which it is desired that the pump structure shall be as compact as .possible, it is preferable only partly to remove the valve e from the suction stream. In this event' the valve is furnished at a sultable place with an aperture of such cross section y that on normal working commencing there is ample passage for unobstructed-flow of the suction stream. In add1t1on to this, the

valve is then made open internally, and the wheel is not balanced, as is customary, by

the provision of holes. In this manner low outside the wheel from the discharge to the suction chamber is prevented.

The valve Ve can be actuated by means, for I instance, of a screw spindle and acrank handle z', a hand wheel or the hke; or 1t may lbe operated automatically as soon as 'the pump is `suiiiciently evacuated.

Whenthe valve is entirely removed from the suctionstrem, it 1S not possible, 0n the suction passage being closed by the sliding valve, to prevent a part of the water,iwhich lfills the pump casing, being shut in and so offering resistance to'the further axial motion of the valve. To obviate this drawback a groove .7c is provided in the wall of the casing, which groove in the position of the valve in which the suction 'passage is closed, allows 4escape of the confined water, Where- Fig. 5, the initial part of the inner circumdicated by the line 1J-y) concentrically with ferential wall of the chamber runs (as inthe wheel, so that the ring of water is caused to contact with the valve over aconsiderable distance, whereby the air drawn in is effectively forced outV of the exit. The various forms of construction may by the addition of built as high pressure lpaumps. Y Having thus descri 'd our invention, we declare that what we claim as new is- 1. a centrifugal pump, in combination, a casing having a suction inlet and a delivery outlet and an airE exit, a revoluble blade wheel mounted inthe casing, and an axially slidable valve located concentrically with the wheel and which when slid within the latter .connects one partfof the wheel witli the said suction inlet and another part with the said air em't.

2. In acentriugal pump, combination,

a casing havin a suction inlet and a delivery outlet -an an air em't, and a valve controlling the latter, a revoluble blade wheel mounted in the casing, andan axially As shown inl slidable 'valve .located concentrically with the wheel and which whenslid within the latter connects oneA part of the wheel with the'suction inlet and another part with the said `air exit.

. 3.`In a'centri'fugal pump, in combination, a casing having a suction inlet and a delivery outlet and an air exit, a revoluble `blade wheel mounted inthe casing, and an axially slidable valve located concentrically with the wheel and which when slid within the latter connects one part of the wheel with the suction inlet and another part with the said air exit, said casing also having a groove which, when the valve on being slid out of the wheel closes the suction inlet, c011- stitutes a fluid passage` between the space behind the valve and the suction inlet.

4'. In 'a centrifugal pump, in combination, a casing having a suction inlet and a delivery outlet "and an air exit, a revoluble blade wheel mounted in the casing, andan axially slidable valve located concentrically with the Wheel andwhich when slid Within the lat- 'ter connects one part of the wheel with the suctioninlet and anotherpartl iWith the saidl air exit, the cross section of the spiral which the wheel describes moreoven exhibiting an extension in axial direction. further normal guide wheel pumps also be 5. In a centrifugal pump, in combination,

a casing having a suction inlet and adeliv- 4ery outlet and an air exit, a revoluble blade wheel mounted in the casing, and an axially slidable valve located concentrically with the wheel and which when slid within the latter connects one part of the Wheel with "the suction inlet and another part with the said air exit, the initial part of the inner circumvso.v

ferential vwall of the Wheel chamber running concentrically with the wheel.

In testimony whereof we aiiix our signatures in presence of two witnesses.

' JOSEF LEI-INE.

WILHELM LUCKE.

Witnesses:

AWILHELM KOCH, HENRY HASPER. 

